How do I recover ssbackups registration code?


Imagine if I have cloud backups set up. They are backed up and uploaded on regular basis till things go wrong. Then some disaster happens, I lost all my data and I actually need my backup back.
But to get my cloud backup I need my /usr/share/server-uplink/registration_code file, which is lost due to the disaster. I’ve searched, but couldn’t find anything related to cloud backups or registration code.
I have a non-cloud backup, which doesn’t have that file either.
So what is the suggested workflow for the registration code?